Cross-arm



1,620, 4 March 15, 1927. C. w. cAssEl-S I 9 cRoss ARM Filed Dame, 1925 v Invenhn.

Patented Mar. 15, 1927.

-unitan sTArEs .620.949 P came.

CHARLES WELLMAN onssnies, :01? HAMILTON, ONTARIO, onnAnn, ASSIGN'OR T 'rnn N. SLAATERCOMIPANY, LIMITED, or HAMILTON, oIvTARIOQGANADA.

' CROSS-ARM.

Application filed "December 6, 1923.. Serial No. 628.965

Fly invention relates to improvements in cross-arms for supporting transmission wires and more particularly-multiple wire parts.

lines, :and the object of the invention is to devise :an improved form of metallic 'cross arm which will'be of simple and inexpensive construction, which may be .very conveniently and quickly mounted upon :the supporting pole asasingle =unit, and which will have exceptional strength and rlgldity; a further object is to devise such a cross-arm which will provide ample clearance for all transmission wires carried thereby; and a still further object is .to provide a construction using very few separate parts and reducing to a minimum the number of loose .My invention consists essentially of a cross-arm, comprising a horizontal and a vertical branch constructed and arranged all as hereinafter more particularly described and illustrated in the accompanying drawings in which Fig. 1 is a front elevation of my improved cross-arm, the relative position of a supporting pole being indicated in broken lines. 1

Fig.2 is a side elevation of Fig. 1 looking in the direction of the arrow. V V Fig. 3 is a section on the line 3, 3 of Fig.1.

Fig. 4 is a section on the line 4,4 of Fig. 1. Inthe drawings like characters of-referfence indicate corresponding'parts in the different views.

My improved cross-arm comprises the lowerrhorizontal branch 1 and the upper vertical branch 2. p

The horizontal branch 1 is formed from a length ofrolled T-section, '3 being the web 1 or stem portion of the section and 4 the flanges thereof.

The ends of the branchl are turned'upwardly at 5 and are formed to receive the insulator supporting springs 6.

The vertical branch 2 is formed from twolengths'of rolled channel sections 7 and 8 placed back to back (see Fig. 3) and secured together by rivets 9. 7

At the upper end of the vertical branch the channel sections'are formed to receive the insulator supportingspring 10. p I, The channels 7and 8 extend downwardly beyond their secured together portions,

which secured together portions constitute the vertical branch of the cross-arm, towards-- through the orifices 14 and 15 the horizontal branch and these extending portions are bent laterally away from each otherto {form the divergent inclined braces 11 and 12. I

' The lowerends off these braces lieon'o'ppo- "site sides-ofihe web or' stem 3 of the hori- '6 zontal .branch 1 and .are secured thereto by ri-vets13; .r x

The vertical branch is providedrwithia bolt hole 14, 'a'ndxthe horizontal -'branch is provided with'a similar .b'olt hole 15 located centrally thereof through. the web 8. 16 indicates in broken lines the relative position of a circular supporting pole on which the cross-arm is mounted. Centrally of the horizontal branch 1 and.

onthe side thereof adjacent to the pole 16 the flange 4 is deformed to form a concave seating 17 adapted to engage or straddle the pole as willhereinafter appear.

The construction and operation of my inply securing the horizontal branch 1 to the braces 11 and 12by the rivets 13. This completes the formation of the cross-arm, and it will be noted that the portions 11 and 12 of the channels constitute cross-arm braces formed integrally with'the vertical branch.

These divergent braces 11 and 12- are practically formed by bending -what may be termed divided portions extending integrally from the lower end of the vertical branch.

The insulator supporting springs 6 and. 10 are-then mounted. p -This completes the construction of the crossarm which it will be noted comprises a simple unit having exceptional strength and rigidity.

. Thecross-arm is mounted upon the supporting pole 15"bysimply passingtwo bolts 7 the pole.

the pole and does away with the necessity of and through 51 V The deformed concave seating 17 engages V cutting the pole to receive the flange 4 at this point. r

Thus there is no weakening efiect upon the pole at this point.

This seating also increases the rigidity of the mounting upon the pole;

From the foregoing it will be noted that I have devised valuable improvements in I cross-arms of this type.

Various modifications may be'inade in my invention Without departing from the spirit of the inventionor the. scope of the claim and therefore the exactforin shown is to be taken as illustrative only and not in a limit ing" sense. 2

For instance While I haveillustrated the application of insulator supporting springs 6 and 10 this forin of insulator mounting forms no part of my present invention and any Well knownstyle of insulator mounting Inightequally Well be employed.

What I claim as my invention is: i

A metallic cross-arm of the class described izontal branch on opposite sides thereof, the central'portion of the flange 'oftheT-shaped horizontal branch on one. side thereof deformed to form a concave seating.

CHARLES Li IA cassniis.

cured to the Web or stem portion of the l'ior- 

